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Targetless Registration: By the Numbers
•Present a method for validating targetless registration accuracy
•One that can be reproduced by anyone
• Initiate a discussion on other techniques for ensuring the accuracy of targetless registration.
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Targetless Registration: By the Numbers
• A single scan is going to be very accurate (+/- 2mm)
• Greatest potential for error occurs in registration of multiple scans.
• Want to encourage some type of accuracy check in every scanning “opportunity”
• Error isn’t a bad thing as long as you know what it is. Everything has error
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Targetless Registration: By the Numbers
• Love targeted registration
•Hate targeted registration
• Love targetless registration
•Hate targetless registration
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Targetless Registration: By the Numbers
•Have had projects that should have worked targetless and did not
• Long sections of flat roads (did not)
•Hilly section of road (did.. Sort of)
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Targetless Registration: By the Numbers
• Equipment Used for test:
• Faro X330, specially outfitted Dustin Forensics version
• Faro 145mm spherical targets
• Faro checkerboard targets
• Leica DISTO E7500i Laser Distance Meter
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Targetless Registration: By the Numbers
• Faro X330, specially outfitted Dustin Forensics version (kidding)
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Targetless Registration: By the Numbers
• Faro 145mm spherical targets mounted to tripods (about 12 used for the test)
• Faro checkerboard targets printed via laser printer, affixed to flat surfaces via adhesive tape
•Note: checkerboard targets were not used for registration
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Targetless Registration: By the Numbers
• Leica DISTO E7500i Laser Distance Meter
•Mounted to various tripods for stability
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Targetless Registration: By the Numbers
• Method
• Place targets
• Scan area with targets in position
• Perform hand measurements with tape (discontinued due to wind and inaccuracies)
• Perform measurements with Disto
• 3 measurements per target pair, average results
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